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Calculating the Probability of Occurrence

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Roger has read a report that the weights of adult mail Siberian tigers have a distribution which is approximately normal with mean = 390 lb and standard deviation = 65 lb.
a) Find the probability that an individual male Siberian tiger will weigh more than 450 lb.
b) Find the probability that a random sample of 4 male Siberian tigers will have a sample mean weight more than 450 lb.

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